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$image-path: '../img' !default;
$fallback-extension: 'png' !default;
$retina-suffix: '@2x';
@mixin background-image($name, $size:false){
    background-image: url(#{$image-path}/#{$name}.svg);
    @if($size){
        background-size: $size;
    }
    .no-svg &{
        background-image: url(#{$image-path}/#{$name}.#{$fallback-extension});

        @media only screen and (-moz-min-device-pixel-ratio: 1.5), only screen and (-o-min-device-pixel-ratio: 3/2), only screen and (-webkit-min-device-pixel-ratio: 1.5), only screen and (min-device-pixel-ratio: 1.5) {
          background-image: url(#{$image-path}/#{$name}#{$retina-suffix}.#{$fallback-extension});
        }
    }
}